[PATCH] doc: reference COPYING from README

* README: Reference COPYING as per the GNU coding standards,
and enforced by a new syntax-check from gnulib.
---
 README | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README b/README
index 80bfb5f5..0bd9ea93 100644
--- a/README
+++ b/README
@@ -6,6 +6,8 @@ options, some borrowed from Unix and some unique to GNU.
 
 See the file NEWS for a list of major changes in the current release.
 
+See the file COPYING for copying conditions.
+
 See the file INSTALL for compilation and installation instructions.
 
 If there is no file INSTALL, you must be looking at the checked-out
-- 
2.42.0